diff --git a/singe/singe.c b/singe/singe.c
index 328475c9d..8a1195b41 100644
--- a/singe/singe.c
+++ b/singe/singe.c
@@ -359,7 +359,7 @@ int32_t apiColorBackground(lua_State *L) {
 						if (lua_isnumber(L, 4)) {
 							d = lua_tonumber(L, 4);  _global.colorBackground.a = (byte)d;
 						} else {
-							_global.colorBackground.a = (byte)255;
+							_global.colorBackground.a = (byte)0;  // Default to transparent.
 						}
 					}
 					result = true;
@@ -396,7 +396,7 @@ int32_t apiColorForeground(lua_State *L) {
 						if (lua_isnumber(L, 4)) {
 							d = lua_tonumber(L, 4);  _global.colorForeground.a = (byte)d;
 						} else {
-							_global.colorForeground.a = (byte)255;
+							_global.colorForeground.a = (byte)255;  // Default to opaque.
 						}
 					}
 					result = true;